Quilt Binding Calculator

Most quilters choose binding strap widths between 2 and 2.5 inches. A 2.25-inch strap is the most common choice, giving approximately 0.375 inches of visible binding on each side. For baby quilts, 2 inches works well, while larger bed quilts may benefit from 2.5-inch straps.

Always add 10 inches to your quilt perimeter for binding overage. This extra length accounts for the diagonal seams used to join binding strips and the final join where the binding ends meet. Without this overage, you may come up short.

Straight binding is cut along the fabric grain and works best for straight-edged quilts. Bias binding is cut at a 45-degree angle, giving it stretch that conforms to curved edges. Bias binding also wears longer since the bias grain distributes stress better.

Place two binding strips right sides together at a 90-degree angle. Sew diagonally from the top left to bottom right corner of the overlap. Trim the excess fabric to a 0.25-inch seam allowance and press the seam open. This method reduces bulk compared to straight seams.

For bias binding, the calculator determines the total fabric area needed (binding length × strap width). You can cut this from a square (side = √area) or a rectangle. The most efficient method uses a square cut on the bias to maximize fabric use.

Yes, pre-made binding tape is available at fabric stores. However, making your own binding allows you to match your quilt perfectly and control the fabric quality. Our calculator helps you determine exactly how much fabric to buy for custom-made binding.